The Patio Pacific Thermo Sash IIIe Pet Door is the premium solution for adding a pet door to your sash style window. It is far more energy efficient than cheaper single pane pet doors for sash windows, and combines dual-pane, low "e" glass with the superior, award winning Endura Flap (see below). It is highly wind-resistant and includes a "draft stopper". The Thermo Sash IIIe pet door is constructed of beefy metal framing and has a sturdy locking flap cover. The spring loaded design ensures that this pet door can be installed and removed in seconds, no tools are required for installation. There is even a couple of built-in "anti-whoops" features that allow you to adjust your panel by 3/4" to make a perfect fit or even make corrections to your installation, just in case your measurements are slightly off.

The heart of any pet door is the flap, and pet door flaps have always been a big disappointment to the pet door owner. They leak, they don't insulate, they pinch the pet, they blow open, they don't fit the pet and they wear out quickly so the user needs to buy an expensive replacement flap and start over again. Until Now! The award winning Endura Flap Pet Door for Doors is the premium solution for adding a pet door to your home. If you've never owned a pet door before, you're going to be very satisfied - it does everything you think it should. But if you have ever owned a pet door, hold on to your socks. You're not going to believe how much better this is that what you've had in the past.

The standards which the Endura Flap is built, and no other pet door is, are as follows:

Be flexible and safe

Seal tightly against weather - Insulate like dual pane glass - Not yellow in the sun

Last 'forever' - Remain flexible in very low temperatures - Have appropriate dimensions